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Main Navigation Welcome to Granite Mountain Charter School We are very excited to have you join our dynamic community. See Our Approach At Granite Mountain Charter School we take great pride in being able to offer our students flexible personalized learning experiences through our many unique and dynamic programs. Enroll Now Contact us Calendar Granite Mountain Charter School GMCS We are here to serve support and inspire community within our school and all families on an educational journey with their children. Granite Mountain Charter School is a tuitionfree public charter school serving Transitional Kindergarten through 12thgrade students in San Bernardino Riverside Los Angeles Kern Inyo and Orange Counties.